Messages in this thread | | | Date | Thu, 21 Mar 2013 12:13:53 +0530 | From | Vinod Koul <> | Subject | Re: [PATCH v4 1/3] dmaengine: add dma_get_slave_sg_limits() |
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On Wed, Mar 06, 2013 at 02:56:05PM -0500, Matt Porter wrote: > Add a dmaengine API to retrieve slave SG transfer limits. > > The API is optionally implemented by dmaengine drivers and when > unimplemented will return a NULL pointer. A client driver using > this API provides the required dma channel, address width, and > burst size of the transfer. dma_get_slave_sg_limits() returns an > SG limits structure with the maximum number and size of SG segments > that the given channel can handle. > > Signed-off-by: Matt Porter <mporter@ti.com> > --- > +static inline struct dma_slave_sg_limits > +*dma_get_slave_sg_limits(struct dma_chan *chan, > + enum dma_slave_buswidth addr_width, > + u32 maxburst) > +{ > + if (chan->device->device_slave_sg_limits) > + return chan->device->device_slave_sg_limits(chan, > + addr_width, > + maxburst); Hi Matt,
Sorry for delayed reply, this series was sent just before i went for vacation :)
I agree with Lars, that returning pointer maynot be good idea. So this bit needs work. Also the readblity of above is bad by complying to 80char limit. I would make it easier to read
-- ~Vinod > + > + return NULL; > +} > + > enum dma_status dma_sync_wait(struct dma_chan *chan, dma_cookie_t cookie); > #ifdef CONFIG_DMA_ENGINE > enum dma_status dma_wait_for_async_tx(struct dma_async_tx_descriptor *tx); >
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